基于信号流程的电子装备机理建模方法

针对面向电子装备战斗操作训练和技术维修训练的模拟器,研究机理模型建模问题。首先总结了当前主要的建模方法,进而根据模块化思想,提出了基于信号流程建立电子装备的机理模型,共分为装备分解,提取信号流程图、建立子模型、建立完整机理模型等四个步骤。阐明了建模过程,重点介绍了如何构建子模型和完整模型。讨论了模型的时间管理机制,多分辨率建模等问题,分析了该方法在故障建模中的应用,并提出了一个三级分辨率的机理模型体系。该方法的创新点包括：通过调整模型分辨率,可以兼容其他主要建模方法;同时能有效解决故障装备机理建模的问题。分析表明,该方法可以满足当前模拟器在各个层次上对机理模型的需求。     

基于条件随机场的模型特征线提取方法

本文提出了一种草图指导的三维模型特征线提取方法,该方法特点在于:一方面,建立了笔画采样点与模型特征线点间的条件随机场匹配模型,将模型几何特征与形状相似性结合匹配,实现了草图信息与模型特征线提取的有效融合;另一方面,提出了基于结构相似性的模型特征线度量机制,并采用迭代优化方法实现了全局最优模型特征线的提取.实验结果表明:本文提出的方法能有效获取与草图结构形状相对应的模型特征线绘图.     

等离子体刻蚀工艺模型研究进展

综述了等离子体刻蚀模型的研究进展,包括粒子方法模型和动力学模型的现状与进展。粒子方法模型主要介绍蒙特卡洛模型和结合蒙特卡洛模型的混合模型,动力学模型主要介绍反应位点模型、分子动力学模型和混合层动力学模型。在每种模型中,讨论了该模型的优缺点及应用范围。在此基础上,总结了过去刻蚀模型的发展历程,展望了等离子刻蚀模型的发展前景,对进行等离子刻蚀的建模分析具有参考意义。     

基于SPIN的模块化模型检测方法研究

该文针对模型检测过程中所存在的状态爆炸问题,提出了一种基于模型检测工具SPIN的模块化模型检测方法。所提出的方法能够将指定的抽象模型分解成若干的模块,并对这些验证复杂度相对低的模块执行模型检测,以替代对原模型的模型检测。所提方法所用的分解过程保留了原模型所有的语义,同时不增加额外的语义,从而使得验证所有模块等同于验证原模型。理论和实验分析结果显示了所提方法的有效性。     

基于描述逻辑的CIM模型

分析了CIM模型在自主计算中的研究现状和存在的问题,在GLanfranchi和ACali的基础上提出了一种具有演化功能的CIM模型。针对CIM模型的特点和需求,提出了一种基于描述逻辑DLRifd的CIM模型,即给出了将CIM模型转化为描述逻辑DLRifd知识库的方法,证明了该转化方法的正确性。以及给出了自动判断CIM模型一致性、冗余性、包含关系的方法,也证明了这些判断方法的正确性。     

封装基板过孔电特性建模方法

基于电路二端口网络理论,建立了过孔电学特性等效电路模型,给出了模型参数的提取过程。在分析比较物理模型和经验模型两种不同的模型参数提取方法及其优缺点的基础上,给出了过孔高频特性的经验模型及其模型参数。为验证经验模型的有效性,提出了基于仿真的快速验证方法。实验结果表明,该方法避免了实物测试验证所带来的测试误差,同时为降低建模成本提供了新思路。     

基于特征线方法的无源传输线模型

基于特征线方法的传输线模型只能保证模型的因果性,但是不能保证模型的无源性。针对上述问题,该文提出了一种无源性补偿方法来实现传输线宏模型的无源性。该方法扩展了现有的用于集总模型的无源性补偿算法,以等式约束的二次规划方法为基础,采用拉格朗日乘数法进行优化。数值例子表明该方法在有限的仿真时间内产生了精确的无源宏模型。     

一种结合位置信息的混合模型图像分割方法

提出了一种新的受位置约束的混合模型图像分割方法。该方法在独立混合模型的基础上,采用空间滤波方法对像素所属分量的后验概率进行修正,在混合模型中隐含地加入了像素的空间位置信息。这种结合位置信息的方法为混合模型的分量选择提供了一种有效的实现方式。与其它的受位置限制的混合模型相比,该方法没有引入额外的模型参数,并且无需采用模型选择准则,可以实现自动的混合分量个数的选择。     

深亚微米CMOS器件建模与BSIM模型

介绍了深亚微米CMOS器件基于电荷模型、基于表面势模型和基于电导模型的建模方法及其优缺点,并以BSIM系列模型为例,讨论了BSIM系列模型特点及半导体工艺发展对CMOS器件建模方法的影响。     

无线传播模型研究

分析了电波传播模型校正原理,探讨了无线传播模型的校正方法,并根据上述原理和方法对武汉密集市区的无线传播模型进行了校正.     

无人机SAR/MTI侦察技术中若干问题的探讨

本文介绍了国外无人机SAR／MTI雷达研究现状和发展方向,列举了X、Ka,Ku三种频段SAR／MTI雷达主要技术指标,重点从工程实现的角度对SAR／MTI雷达技术中若干问题进行了探讨,包括无人机、SAR的成像模式和MTI兼容技术、频段选择、SAR成像实时数据的传输方式、惯导系统、最后讨论了成像算法。     

Alternative Schemes for Dynamic Secure VPN Deployment in UMTS

Three alternative schemes for secure Virtual Private Network (VPN) deployment over the Universal Mobile Telecommunication System (UMTS) are proposed and analyzed. The proposed schemes enable a mobile node to voluntarily establish an IPsec-based secure channel to a private network. The alternative schemes differ in the location where the IPsec functionality is placed within the UMTS network architecture (mobile node, access network, and UMTS network border), depending on the employed security model, and whether data in transit are ever in clear-text, or available to be tapped by outsiders. The provided levels of privacy in the deployed VPN schemes, as well as the employed authentication models are examined. An analysis in terms of cost, complexity, and performance overhead that each method imposes to the underlying network architecture, as well as to the mobile devices is presented. The level of system reliability and scalability in granting security services is presented. The VPN management, usability, and trusted relations, as well as their behavior when a mobile user moves are analyzed. The use of special applications that require access to encapsulated data traffic is explored. Finally, an overall comparison of the proposed schemes from the security and operation point of view summarizes their relative performance. Christos Xenakis received his B.Sc. degree in computer science in 1993 and his M.Sc. degree in telecommunication and computer networks in 1996, both from the Department of Informatics and Telecommunications, University of Athens, Greece. In 2004 he received his Ph.D. from the University of Athens (Department of Informatics and Telecommunications). From 1998–2000 was with the Greek telecoms system development firm Teletel S.A., where was involved in the design and development of advanced telecommunications subsystems for ISDN, ATM, GSM, and GPRS. Since 1996 he has been a member of the Communication Networks Laboratory of the University of Athens. He has participated in numerous projects realized in the context of EU Programs (ACTS, ESPRIT, IST). His research interests are in the field of mobile/wireless networks, security and distributed network management. He is the author of over 15 papers in the above areas. Lazaros Merakos received the Diploma in electrical and mechanical engineering from the National Technical University of Athens, Greece, in 1978, and the M.S. and Ph.D. degrees in electrical engineering from the State University of New York, Buffalo, in 1981 and 1984, respectively. From 1983 to 1986, he was on the faculty of Electrical Engineering and Computer Science at the University of Connecticut, Storrs. From 1986 to 1994 he was on the faculty of the Electrical and Computer Engineering Department at Northeastern University, Boston, MA. During the period 1993–1994 he served as Director of the Communications and Digital Processing Research Center at Northeastern University. During the summers of 1990 and 1991, he was a Visiting Scientist at the IBM T. J. Watson Research Center, Yorktown Heights, NY. In 1994, he joined the faculty of the University of Athens, Athens, Greece, where he is presently a Professor in the Department of Informatics and Telecommunications, and Director of the Communication Networks Laboratory (UoA-CNL) and the Networks Operations and Management Center. His research interests are in the design and performance analysis of broadband networks, and wireless/mobile communication systems and services. He has authored more than 150 papers in the above areas. Since 1995, he is leading the research activities of UoA-CNL in the area of mobile communications, in the framework of the Advanced Communication Technologies & Services (ACTS) and Information Society Technologies (IST) programmes funded by the European Union (projects RAINBOW, Magic WAND, WINE, MOBIVAS, POLOS, ANWIRE). He is chairman of the board of the Greek Universities Network, the Greek Schools Network, and member of the board of the Greek Research Network. In 1994, he received the Guanella Award for the Best Paper presented at the International Zurich Seminar on Mobile Communications.     

接入控制器安全网络管理系统的设计与实现

在讨论了接入控制器(AC)网络管理系统安全重要性的基础上,分析了SNMP协议的应用,包括对其3个版本SNMPv1、SNMPv2及SNMPv3的优缺点的对比,并解释了该设备网络管理系统采用SNMPv3版本的原因.详细介绍了AC所实现的管理信息库的内容,包括RFC1213协议、IEEE 802.1x协议、RMON协议、Web DHCP、EAP_OTP、EAP_MD5、EAP_TLS、EAP_SIM等多种认证协议以及网络管理系统的五大功能.最后阐述了AC安全网络管理系统结构的设计与实现.     

集成电路市场及经营模式的分析与探讨

在分析全球集成电路形势的基础上，对通信、消费类电子、化合物半导体IC、MCU、Flash memory等IC市场进行了探讨。论述了IDM和Fabless、Foundry三种经营模式的特点与前途，并对我国集成电路产业的前景及发展模式进行了展望。     

Bioinspired Tunable Lens with Muscle‐Like Electroactive Elastomers

Optical lenses with tunable focus are needed in several fields of application, such as consumer electronics, medical diagnostics and optical communications. To address this need, lenses made of smart materials able to respond to mechanical, magnetic, optical, thermal, chemical, electrical or electrochemical stimuli are intensively studied. Here, we report on an electrically tunable lens made of dielectric elastomers, an emerging class of “artificial muscle” materials for actuation. The optical device is inspired by the architecture of the crystalline lens and ciliary muscle of the human eye. It consists of a fluid‐filled elastomeric lens integrated with an annular elastomeric actuator working as an artificial muscle. Upon electrical activation, the artificial muscle deforms the lens, so that a relative variation of focal length comparable to that of the human lens is demonstrated. The device combined optical performance with compact size, low weight, fast and silent operation, shock tolerance, no overheating, low power consumption, and possibility of implementation with inexpensive off‐the‐shelf elastomers. Results show that combing bioinspired design with the unique properties of dielectric elastomers as artificial muscle transducers has the potential to open new perspectives on tunable optics.     

SOI Technologies Overview for Low-Power Low-Voltage Radio-Frequency Applications

Thanks to their structure, the SOI technologies present several intrinsic advantages for analog and RF applications. Indeed, as it is well established now, these technologies allow the reduction of the power consumption at a given operating frequency. Moreover, the high-insulating properties of SOI substrates, in particular when high resistivity substrate is used, make that these technologies are perfect candidates for mixed-signal applications. In the present paper, we will discuss the performances of the SOI technologies in radio-frequency range. First of all, the high-frequency behavior of SOI substrates, thanks to the characterization of transmission lines, will be shown. The impact of the SOI substrate resistivity on the performances of passive components will also be analyzed. Then, an overview of RF performances of SOI MOSFETs for two different architectures, fully- and partially-depleted, will be achieved and compared to the bulk ones. Finally, the influence of some specific parasitic effects, such as the kink effect, the self-heating effect and the kink-related excess noise, on the RF performances of SOI devices will be studied, thanks to a specific high-frequency characterization.     

高速光纤综合通信网络平台研究

现代通信网络应能满足各种通信业务和通信容量日益发展的需求,实现话音、数据、视频、IP等业务的一体化综合交换和传输。在比较TDM、IP和ATM三种协议的基础上,提出"采用内置RPR和MPLS功能的MSTP平台"建设光纤综合通信网络平台的实现方法。MSTP采用SDH的数据帧结构,保持了SDH标准光接口、灵活分插低速信号、自愈环保护和功能强大的网管等优点,可对TDM、IP和ATM协议进行优化传输。     

Energy-efficient resource allocation model for device-to-device communication in 5G wireless personal area networks

In general, there are several many devices that can overload the network and reduce performance. Devices can minimize interference and optimize bandwidth usage by using directional antennas and by avoiding overlapping communication ranges. In addition, devices need to carefully manage their use of resources, such as bandwidth and energy. Bandwidth is limited in wireless personal area networks (WPANs), so devices need to carefully select which data to send and receive. In this paper, an intelligent performance analysis of energy-efficient resource optimization model has been proposed for device-to-device (D2D) communication in fifth-generation (5G) WPAN. The proposed energy-efficient resource allocation in D2D communication is important because it helps reduce energy consumption and extend the lifespan of devices that are communicating with each other. By allocating resources in an efficient manner, communication between two devices can be optimized for maximum efficiency. This helps reduce the amount of energy needed to power the communication, as well as the amount of energy needed to power the device that is communicating with another device. Additionally, efficient resource allocation helps reduce the overall cost of communication, as the use of fewer resources results in a lower overall cost. The proposed efficient resource allocation helps reduce the environmental impact of communication, as less energy is used for communication. The proposed energy-efficient resource allocation model (EERAM) has reached 92.97% of energy allocation, 88.72% of power allocation, 87.79% of bandwidth allocation, 87.93% of spectrum allocation, 88.43% of channel allocation, 25.47% of end-to-end delay, 94.33% of network data speed, and 90.99% of network throughput.     

环氧塑封料中填充剂的作用和发展

环氧塑封料占据整个半导体封装市场的90％左右,而填充剂含量占环氧塑封料的60％～90％,因此填充剂的性能直接影响环氧塑封料的加工性能、机械性能、导热性能和半导体器件的封装工艺性能、导热性能、可靠性能等。另外,当今社会电子技术日新月异,集成电路正向着超大规模、超高速、高密度、大功率、多功能、绿色环保化的方向发展,因此对环氧塑封料的性能要求愈来愈高,相应的填充剂性能也有了许多新的要求,并且也出现了许多新型填充剂。文中详细地介绍了环氧塑封料中填充剂的作用,各种填充剂对环氧塑封料和封装器件的性能影响以及环氧塑封料中填充剂的分类和发展。     

微波处理菘蓝种子的子叶发育与生物光子辐射的相关性

比较研究不同时间长度的微波辐照菘蓝种子对种子萌发率、淀粉酶活性、转氨酶活性、蛋白酶活性、蛋白质含量、游离氨基酸含量、总DNA含量、子叶发育状况及其生物光子辐射强度的影响.采用微波辐射浸泡3h的菘蓝(Isatis ind igotica Fort)种子.与对照相比,四种处理均能不同程度提高菘蓝种子萌发率、淀粉酶活性、转氨酶活性、蛋白酶活性,促进蛋白质、游离氨基酸、DNA合成,促进子叶发育,提高了生物光子辐射强度.低剂量微波辐射能提高种子生理生化代谢机能,促进种子萌发和幼苗生长发育,研究发现8 s微波预处理效果最为显著.